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Top Forums Shell Programming and Scripting Is there any way to makesure that the input from the user is all numbers? Post 14121 by XXXXXXXXXX on Monday 28th of January 2002 01:54:36 PM
Old 01-28-2002
Quote:
Originally posted by Jimbo
if expr "$answer" : "[0-9]*$" > /dev/null ; then
echo 'all digits'
else
echo 'NOT all digits'
fi
thanks
XXXXXXXXXX
 
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ECHO(1)                                                            User Commands                                                           ECHO(1)

NAME
echo - display a line of text SYNOPSIS
echo [SHORT-OPTION]... [STRING]... echo LONG-OPTION DESCRIPTION
Echo the STRING(s) to standard output. -n do not output the trailing newline -e enable interpretation of backslash escapes -E disable interpretation of backslash escapes (default) --help display this help and exit --version output version information and exit If -e is in effect, the following sequences are recognized: \ backslash a alert (BEL)  backspace c produce no further output e escape f form feed new line carriage return horizontal tab v vertical tab NNN byte with octal value NNN (1 to 3 digits) xHH byte with hexadecimal value HH (1 to 2 digits) NOTE: your shell may have its own version of echo, which usually supersedes the version described here. Please refer to your shell's docu- mentation for details about the options it supports. AUTHOR
Written by Brian Fox and Chet Ramey. REPORTING BUGS
GNU coreutils online help: <http://www.gnu.org/software/coreutils/> Report echo translation bugs to <http://translationproject.org/team/> COPYRIGHT
Copyright (C) 2017 Free Software Foundation, Inc. License GPLv3+: GNU GPL version 3 or later <http://gnu.org/licenses/gpl.html>. This is free software: you are free to change and redistribute it. There is NO WARRANTY, to the extent permitted by law. SEE ALSO
Full documentation at: <http://www.gnu.org/software/coreutils/echo> or available locally via: info '(coreutils) echo invocation' GNU coreutils 8.28 January 2018 ECHO(1)

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